var oldLink = null;

function setActiveStyleSheet(link, title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
  if (oldLink) oldLink.style.fontWeight = 'normal';
  oldLink = link;
  link.style.fontWeight = 'bold';
  return false;
}

function selected(cal, date) {
  cal.sel.value = date;
  if (cal.sel.id == "date1" || cal.sel.id == "date2")
    cal.callCloseHandler();
}

function closeHandler(cal) {
  cal.hide();
}

function showCalendar(id, format) {
  var el = document.getElementById(id);
  if (calendar != null) {
    calendar.hide();
  } else {
    var cal = new Calendar(false, null, selected, closeHandler);
    
    calendar = cal;
    cal.setRange(1900, 2070);
    cal.create();
  }
  calendar.setDateFormat(format);
  calendar.parseDate(el.value);
  calendar.sel = el;
  calendar.showAtElement(el);

  return false;
}

var MINUTE = 60 * 1000;
var HOUR = 60 * MINUTE;
var DAY = 24 * HOUR;
var WEEK = 7 * DAY;

function isDisabled(date) {
  var today = new Date();
  return (Math.abs(date.getTime() - today.getTime()) / DAY) > 10;
}